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研究不同热处理工艺对Mg-5Zn-1Er-1Nd-1Ca-0.5Zr合金组织和力学性能的影响。结果表明,铸态合金经520℃×8 h+220℃×(4、8、12)h固溶后时效处理,合金显微组织粗化,晶内出现黑色的花瓣状相偏析,合金的室温拉伸强度有所下降,175℃抗拉强度有所提高,而屈服强度都有较大的提高,在520℃×8 h+220℃×8 h的热处理条件下都达到最大值。铸态合金经220℃×(4、8、12)h时效处理后,晶内析出了较多弥散分布的析出相颗粒,在220℃×8 h时效条件下晶内的析出相颗粒数量最多,室温和175℃抗拉强度和屈服强度都达到最大值。
The effects of different heat treatment processes on the microstructure and mechanical properties of Mg-5Zn-1Er-1Nd-1Ca-0.5Zr alloy were studied. The results show that the microstructure of the as-cast alloy after aging treatment at 520 ℃ for 8 h and 220 ℃ for 4,8,12 h after solid solution treatment is coarsened and the black petaloid segregation appears in the grain. The room temperature Tensile strength decreased, the tensile strength at 175 ℃ increased, and the yield strength has greatly increased, reaching the maximum under the heat treatment conditions of 520 ℃ × 8 h + 220 ℃ × 8 h. After aging at 220 ℃ for 4, 8, and 12 h, the precipitated phase grains were precipitated in the as-cast alloy. The precipitated phase grains were the most precipitated at 220 ℃ for 8 h, Room temperature and 175 ℃ tensile strength and yield strength have reached the maximum.